/Engine/Plugins/Runtime/DataRegistry/Source/DataRegistry/Public/DataRegistrySource.h
Attempt to register a specified asset with a source, returns true if any changes were made. Can be used to update priority for existing asset as well
virtual bool RegisterSpecificAsset ( const [FAssetData](API\Runtime\CoreUObject\AssetRegistry\FAssetData) & AssetData, int32 AssetPriority )